Malicious PDF — malware analysis report

Static analysis result for SHA-256 222257db853f4b80…

MALICIOUS

PDF

42.2 KB Created: 2021-06-03 10:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d2b5497dda938535634da1c108b823a SHA-1: d7ed95ff1d02120fc85052fa856ffba4c8845e6a SHA-256: 222257db853f4b8008728260558297a9a832288b80e7ba55143ab9d90490b44c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a game hack or generator. One critical heuristic identified a link to known malicious redirector infrastructure, specifically https://netcdn.online/app/406889139/25-free-spins-coin-master-game-hack. The document body, though partially corrupted, also contains this URL and other suspicious links related to free game currency and hacks. No scripts were extracted from this sample, but the embedded links strongly suggest a phishing or scam attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/25-free-spins-coin-master-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/spin-coin_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ae5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE5 24224 bytes
SHA-256: 26cb3d0a3ee31998b41116ca933e8b3f42d9874f13c74fa4d0b215fd4eec86db
font_01_sfnt_off0000825b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x825B 18144 bytes
SHA-256: e61324631e03e98c071e12442239b73d0a12fcb8243797d210d051c8d69b565d

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